2 #ifdef BN_MP_COUNT_BITS_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
8 * The library was designed directly after the MPI library by
9 * Michael Fromberger but has been written from scratch with
10 * additional optimizations in place.
12 * The library is free for all purposes without any express
15 * Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org
18 /* returns the number of bits in an int */
20 mp_count_bits (mp_int * a)
30 /* get number of digits and add that */
31 r = (a->used - 1) * DIGIT_BIT;
33 /* take the last digit and count the bits in it */
34 q = a->dp[a->used - 1];
35 while (q > ((mp_digit) 0)) {